USE OF PHOSPHORUS IN DIFFERENT FORMS 



279 



"Since 1894 no phosphate of any kind has been applied to these plots, but 

 the quantity of nitrate of soda and of potash-magnesia sulfate has been used in 

 one half greater quantities. 



"At first Doctor Goessman included no plot on which phosphate was not used 

 for comparison with the others. Later such a plot was added, but it was left 

 entirely unmanured until 1896. During 1896 and 1897 it has received the 

 nitrate of soda and potash-magnesia sulfate at the same rate as the other plots." 



The data (excepting from plot 3) are recorded in Table 48. 



TABLE 48. MASSACHUSETTS EXPERIMENTS WITH EQUAL MONEY VALUES OF 



DIFFERENT PHOSPHATES 

 Pounds per Plot (about 6600 Square Feet) 



PLOT No 



PHOSPHATE APPLIED 



NONE 



SLAG 

 PHOS- 

 PHATE 



GUANO 

 PHOS- 

 PHATE 



S.C. 

 RAW 



PHOS- 

 PHATE 



ACID 

 BONE 

 BLACK 



1890 Potatoes 1600 



1891 Wheat, grain 67 



1891 Wheat straw 313 



1892 Serradella (air-dry) . 



1893 Ear corn 470 



1893 Corn stover 1190 



1894 Barley, grain 169 



1894 Barley straw 221 



1895 Rye, grain 195 



1895 Rye straw . . 



1896 Soy beans, grain 



1896 Soy bean straw 426 



1897 Swede turnips (roots) .... 830 1870 



1898 Corn . . . 



1899 Oats .... 



1900 Cabbage (heads) 103 900 



1415 



73 

 267 



682 



810 



148 



1 66 



465 



540 

 3 6 55 



830 



1830 



78 

 302 



622 



580 

 890 



144 

 216 



189 

 57 



1965 



1500 



2I2O 



346 



584 



542 

 780 



118 

 272 



440 



247 

 495 



1619 



Pounds per Acre 



1890-1893 Phosphorus applied . . 

 1890-1900 Phosphorus removed 



None 



278 

 124 



207 



121 



4l6 

 122 



142 

 Il6 



1900 Balance not removed 

 Phosphorus unused, per cent . 



55 



86 

 43 



294 

 7i 



26 



